Is there an easy way to hide an application's dock icon? For example, I can't hide Iconfactory xScope dock icon. Most similar apps a preference settings to hide the dock icon, but I can't seem to find one in this app's preferences.

This hides the dock icon but also hides the app's menu bar which makes some features unusable (such as creating a new Guide line).
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titaniumdecoyApr 8 '11 at 21:49

@titanium There's no way to hide the dock icon without hiding the menu bar. This has been asked before on other sites, and no one's ever gotten past the menu bar problem.
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Nathan GreensteinApr 9 '11 at 0:15

I don't have a copy of xScope so I'm not aware of all the side effects of not accessing the menu, my solution has all the same effects of the Dock Dodger or Dockless solutions, because I believe they are more or less GUI's for the edits shown in this answer.
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NillocApr 9 '11 at 19:18

I'm marking your answer as accepted since I don't think there is a good solution to my question.
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titaniumdecoyApr 9 '11 at 19:53

There are apps that let you hide any app's dock icon. The ones I've heard of are Dock Dodger and Dockless (both available for free).

Keep in mind that any of these apps will also hide an app's menu bars (, app, File, Edit, etc.). This is unavoidable, as best I can tell.
Note that xScope's menu bar app (on the right, with Spotlight) will stay.